engines: add zjs

engines/zjs/Dockerfile

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+# SPDX-FileCopyrightText: 2026 Aneryu
+# SPDX-License-Identifier: MIT
+
+ARG BASE=jsz-zig
+FROM $BASE
+
+WORKDIR /src
+ARG REPO=https://github.com/aneryu/zjs.git
+RUN git clone --depth=1 "$REPO" .
+
+ARG REV=main
+RUN git fetch --depth=1 origin "$REV" && git checkout FETCH_HEAD && git rev-parse HEAD
+
+RUN case "$(dpkg --print-architecture 2>/dev/null || true)" in \
+      arm64) zig build zjs -Dcpu=baseline --summary all;; \
+      amd64) zig build zjs -Dcpu=x86_64_v3 --summary all;; \
+      *) zig build zjs --summary all;; \
+    esac
+
+COPY build/dist.py ./
+RUN ./dist.py /dist/zjs --binary=/src/zig-out/bin/zjs

engines/zjs/Makefile

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+# SPDX-FileCopyrightText: 2026 Aneryu
+# SPDX-License-Identifier: MIT
+
+include ../../build/build.mk
+
+SUPPORTED_ARCHS = amd64 arm64
+
+$(eval $(call build_engine,zjs,Dockerfile))

engines/zjs/README.md

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+# zjs
+
+Zig-native JavaScript engine, source-aligned with QuickJS.
+
+* Repository:  [aneryu/zjs](https://github.com/aneryu/zjs.git) <span class="shields"><img src="https://img.shields.io/github/stars/aneryu/zjs?label=&style=flat-square" alt="Stars" title="Stars"><img src="https://img.shields.io/github/last-commit/aneryu/zjs?label=&style=flat-square" alt="Last commit" title="Last commit"></span>
+* LOC:         [235432](# "cloc src")
+* Language:    Zig
+* License:     MIT
+* Standard:    ES2023 (partial)
+* Years:       2026-
+* Ancestor:    [QuickJS](../quickjs/README.md)
+* Interpreter: stack-based VM
+* GC:          reference counting with cycle removal
+
+zjs is a Zig rewrite that uses QuickJS as its semantic reference. It provides
+a Zig embedding API, a standalone command-line interpreter, and syntax-only
+TypeScript erasure. It is not a drop-in replacement for QuickJS's C API.